REQUIREMENT(so, there's apparently some way of making this mod without any requirements and stantalone? this is my first mod, so I have no idea how to do that...)

ECE is only required for the eyebrows texture. As pingpan has pointed out (thank you!), you only need the texture files from ECE. Download the ECE rar file, navigate to folder "01 ECE", and simply copy the Texture folder into your own Data folder.